Do you have video distortion, vertical lines or no display at all? Chances are you are suffering from a GPU failure on your graphics card. We see this a lot! We repair about 20 GPU faults a month, especially on 27″ iMacs. The problem is two fold. Firstly, the solder used on the chips is alloy solder, not lead. Alloy solder tends to be not as long lasting as lead solder and due to the heat generated by the GPU, the solder starts to deteriorate, causing the video distortion.
So, how do we fix it? We do something called a reball. Reballing is done by using an expensive reballing workstation that uses infra red to heat up the solder balls on the GPU, we remove the GPU, clean the board and remove all the solder. We then re-solder using lead solder. We stress test the GPU for 24 hours to make sure the problem is resolved, if not, we replace the GPU altogether.
DO NOT PUT YOUR MAC MOTHERBOARD IN THE OVEN!
This might seem a strange thing to say, but that is what some websites will tell you to do. So why does this sometimes work? Well, it is not because you have solved the above issue, solder does not melt at oven temperatures. What is happening is, you are causing the chip to expand in the oven, and this causes a temporary fix, a few days, a week, maybe a month but it will fail again.
So if you have a video issue on your Mac, send it to us and let us fix it properly for you. All repairs come with a 90 day warranty.
The average cost of a GPU repair is £275
Use the button below to book your repair. We will collect your iMac free of charge and drop it back to you when it is repaired. Average repair time is 7-10 working days.